API 7-2002 pdf free download
API 7-2002 pdf free download.Specification for Rotary Drill Stem Elements .
4 Upper and Lower Kelly Valves and Other Drill Stem Safety Valves 4.1 GENERAL This specification primarily specifes the minimum design, material, inspection and testing requirements for upper and lower kelly valves. This specification also applies to dril-stem safety valves used with overhead drilling systems. It applies to valves of all sizes with rated working pressures of 5,000 through 15,000 psi (34.5 through 103.4 MPa) applied in nor- mal service conditions (H2S service conditions are addressed as a supplemental requirement). Rated working temperatures are -4°F (- 20°C) and above for valve bodies; sealing system components may have other temperature limitations. 4.2 DESIGN CRITERIA The manufacturer shall document the design criteria and analysis for each type of valve produced under this specfica- tion. This documentation shall include loading conditions that will initiate material yield for valve body with minimum material properties and tolerances under combined loading; including tension, intemal pressure and torsion. Body mate- rial yield loading conditions shall be documented in tabular form. The minimum design yield safety factor shall be 1.0 at the shell test pressure found in Table lc. 4.2.1 Material Requirements For material requirements, see 1.2. Minimum mechanical properties shall conform to material requirements for drill collars as specified in Section 8. Note: Mechanical properties shall be dctermincd by tests on cylin- drical tensile specimens conforming to the requirements of ASTM A370, 0.2% offsct method.
3.7 drift: A gauge used to check minimum ID of loops, flowlines, nipples, tubing, casing. drill pipe, and drill collars. 3.8 drill collar: Thick walld pipe to provide siffness and concentration of weight at the bit. 3.9 drill pipe: A length of tube, usually steel, to which special threaded connections called tool joints are attached. 3.10 forging: (1) Plastically deforming metal, usually hot, into desired shapes with compressive force, with or without dies. (2) A shaped metal part formed by the forging method. 3.11 full depth thread: A thread in which the thread root lies on the minor cone of an extermal thread or lies on the major cone of an intemal thread. 3.12 gauge point: An imaginary plane, in the pin threads, perpendicular to the thread axis, in which the pitch diameter equals the value in Column 5 of Table 25. 3.13 kelly: The square or hexagonal shaped steel pipe con- necting the swivel to the drill pipe. The kelly moves through the rotary table and transmits torque to the drill string. 3.14 kelly saver sub: A short substitute that is made up onto the bottom of the kelly to protect the pin end of the kelly from wear during make-up and break-out operations. 3.15 last engaged thread: The last thread on pin engaged with the box. 3.16 Lgr: Length of threads in the box measured from the make-up shoulder to the intersection of the non-pressure flank and crest of the last thread with full thread depth. 3.17 lower kelly valve (kelly cock): An esentially full- opening valve installed immediately below the kelly, with outside diameter equal to the tool joint outside diameter. Valve can be closed to remove the kelly under pressure and can be stripped in the hole for snubbing operations. 3.18 make-up shoulder: The sealing shoulder on a rotary shouldered conncction.
